Example I may or may not want an MM cart in the future or a different MC and I would want to buy something now that can accommodate a fairly large variety of options vs something that’s more specific to one type of setup. Buy once cry once if you will...with limitations of course.@tommyd902688
FWIW Dept.:
SUTs are not all that specific. They will require loading at the output, depending on the cartridge used and the SUT in use. Jensen transformers makes some of the best for this purpose and also have a pdf on the correct loading for the transformer (assuming also that the input of your Denon is the 47K standard).
However I would have expected a cartridge with 2.5mV to be no worries in this situation- and since you are experiencing weak bass and low output that suggests to me that something is amiss rather than you're actually needing a different phono preamp. I would investigate your tone arm setup first to make sure it really is right! For example the arm height can mess with the bass as can the platter pad itself. I have also seen damaged cartridges where they had low output and no bass because the magnetic motor has been damaged, probably from being dropped. I would exhaust these issues first before buying another phono preamp- if you did buy one and you still had the same problem I'm guessing you would not be happy about that.